DE3839421A1 - Device for constant-level wireless transmission of modulated RF signals - Google Patents

Device for constant-level wireless transmission of modulated RF signals

Info

Publication number
DE3839421A1
DE3839421A1 DE19883839421 DE3839421A DE3839421A1 DE 3839421 A1 DE3839421 A1 DE 3839421A1 DE 19883839421 DE19883839421 DE 19883839421 DE 3839421 A DE3839421 A DE 3839421A DE 3839421 A1 DE3839421 A1 DE 3839421A1
Authority
DE
Germany
Prior art keywords
vehicle
transmission
comparator
connected
device
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19883839421
Other languages
German (de)
Inventor
Jochen Dipl Ing Tretow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Licentia Patent Verwaltungs-GmbH
Original Assignee
Licentia Patent Verwaltungs-GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Licentia Patent Verwaltungs-GmbH filed Critical Licentia Patent Verwaltungs-GmbH
Priority to DE19883839421 priority Critical patent/DE3839421A1/en
Publication of DE3839421A1 publication Critical patent/DE3839421A1/en
Application status is Withdrawn legal-status Critical

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B7/00Radio transmission systems, i.e. using radiation field
    • H04B7/02Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0802Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
    • H04B7/0817Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection
    • H04B7/082Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection with multiple receivers and antenna path selection selecting best antenna path
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B61RAILWAYS
    • B61LGUIDING RAILWAY TRAFFIC; ENSURING THE SAFETY OF RAILWAY TRAFFIC
    • B61L3/00Devices along the route for controlling devices on the vehicle or vehicle train, e.g. to release brake, to operate a warning signal
    • B61L3/16Continuous control along the route
    • B61L3/22Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation
    • B61L3/225Continuous control along the route using magnetic or electrostatic induction; using electromagnetic radiation using separate conductors along the route

Abstract

The invention relates to a device for constant-level wireless transmission of modulated RF signals from a fixed station to a vehicle, the vehicle having a transmission device with transmission antennas which are disposed downstream on the vehicle in series in the direction of travel and which are inductively coupled with a line conductor laid along the route and crossed at specific intervals, the RF signal to be transmitted being routed via two parallel transmission channels. In the invention, the two transmission channels in each case comprise an amplifier stage and evaluating rectifiers which forward their signals into a comparator, each transmission channel being connected to an input of a switching component and the output signal of the comparator determining which of these inputs of the switching component is connected to an output amplifier. <IMAGE>

Description

Die Erfindung betrifft eine Einrichtung nach dem Oberbegriff des Pa tentanspruchs. The invention relates to a device according to the preamble of Pa tentanspruchs.

Es ist bekannt, längs einer Strecke einen Linienleiter zu verlegen, der in einer ortsfesten Station mit Sende- und Empfangseinrichtungen für eine HF-Datenübertragung verbunden ist. It is known to move along a path a line conductor, which is connected in a stationary station having transmitting and receiving devices for HF data transmission. Die auf der Strecke verkehrenden Fahrzeuge besitzen ebenfalls Empfangs- und Sendeeinrichtungen, die mit tels einer Antenne mit dem Linienleiter induktiv gekoppelt sind. The trains running on the track vehicles also have receiving and transmitting devices which are inductively coupled to means of an antenna with the line conductor. Es ist ferner bekannt, den verlegten Linienleiter in bestimmten Abständen zu kreuzen. It is also known to cross the line conductors installed in certain intervals. Das Überfahren der Kreuzstellen wird gezählt und dient dadurch der relativen Positionsfeststellung der Fahrzeuge. The crossing of the cross points is counted thereby serving the relative position finding of vehicles.

Das Einfügen von Kreuzstellen in den Linienleiter hat zur Folge, daß die Empfangsspannung des für die Datenübertragung beim Über fahren der Kreuzstellen nahezu auf Null absinkt. The insertion of cross points in the line manager has the consequence that the receiving voltage of the falls for data transmission in over the crossing points go to almost zero. Um dieser Schwierigkeit abzuhelfen, kann man zwei Antennen am Fahrzeug, in Fahrtrichtung hin tereinander anordnen; To overcome this difficulty, it can be two antennas on the vehicle in the driving direction toward arrange behind the other; damit befindet sich wenigstens eine Antenne stets über dem Linienleiter. thus there is at least one antenna is always above the line conductor. Das erfordert auch, daß stets der Signal führende Empfangskanal sein Signal an das Fahrzeug absetzen kann. This also requires that the signal is always leading receiver channel can sell its signal to the vehicle.

Aus der DE-PS 12 55 725 ist es bekannt, zwei Rahmenantennen an einem Fahrzeug in Fahrtrichtung hintereinander anzubringen, die miteinander induktiv gekoppelt sind, und von denen eine mit einer Sende-/Empfangs einrichtung verbunden ist. From DE-PS 12 55 725 it is known, one behind the other to mount two antennas on a vehicle frame in the direction of travel, which are inductively coupled to each other, and one of which is connected to a device transmitting / receiving. Durch die induktive Koppelung wird eine Pha senverschiebung von ca. 90°el zwischen den in den beiden Antennen emp fangenen respektive von den beiden Antennen ausgesendeten Signalen er reicht. The inductive coupling is a Pha senverschiebung of approximately 90 ° el between the emp captured in the two antennas respectively transmitted from the two antennas signals it extends. Somit wird der Datenaustausch mit längs der Fahrstrecke verleg te Linienleitern auch an Kreuzungsstellen nicht unterbrochen. Thus, the data exchange along the route Verleg th line conductors will not be interrupted at intersections.

Eine ähnliche Einrichtung ist aus der DE-PS 28 40 092 bekannt, bei der der erste Sendekanal aus einem aus einem RC-Glied bestehenden Tiefpaß mit angeschlossenem Trennverstärker, einer nachfolgenden Verstärkerstufe, einem nachfolgenden Bandpaß und einer diesem nachgeschalteten ersten Sendeantenne, der zweite Sendekanal aus einem aus einem RC-Glied beste henden Hochpaß mit angeschlossenem Trennverstärker, einer nachfolgenden Verstärkerstufe, einem nachfolgenden Bandpaß und diesem nachgeschalteten zweiten Sendeantenne besteht, daß die Grenzfrequenzen des Hochpasses und des Tiefpasses so gewählt werden, daß bei der zu übertragenden Frequenz die Phasen der Übertragungsfunktionen des Hochpasses und des Tiefpasses + ϕ und - ϕ betragen, und daß die Grundphasen der Übertragungsfunktionen von Verstärkerstufe und Bandpaß jedes Sendekanals gleich gewählt werden. A similar device is known from DE-PS 28 40 092 in which the first transmission channel from a group consisting of an RC element low-pass filter with attached isolation amplifier, a subsequent amplifier stage, a subsequent band pass filter and a connected downstream of the first transmission antenna, the second transmission channel from a best from an RC element Henden high-pass filter with attached isolation amplifier, a subsequent amplifier stage, a subsequent band pass filter and downstream of this second transmission antenna, in that the cut-off frequencies of the high pass and the low pass filter are chosen so that, when the frequency to be transmitted, the phase of the transfer functions of the high-pass filter and the low pass filter + φ and - φ amount, and that the basic phases of the transfer functions of the bandpass amplifier stage and each transmission channel are chosen to be equal.

Diese Anordnung weist jedoch den Nachteil auf, daß die Länge der Zulei tungen und der Anbringungsort in die Abstimmung eingehen. However, this arrangement has the disadvantage that the length of the Zulei obligations and the attachment site included in the vote.

Die Aufgabe besteht daher darin, unabhängig von der Länge der Zuleitung eine pegeleinbruchfreie HF-Übertragung von einem Fahrzeug zu einer orts festen Station zu ermöglichen. Therefore, the object is to enable independent of the length of the feed line a level drop free RF transmission from a vehicle to a fixed station.

Die Aufgabe wird nach der Erfindung durch die im Kennzeichen des Patent anspruchs angegebenen Merkmale gelöst. The object is achieved according to the invention by the characterizing portion of claim specified characteristics.

Die Einrichtung nach der Erfindung wird im folgenden an einem Ausführungs beispiel anhand einer Zeichnung erläutert. The device according to the invention is for example explained in the following on an execution reference to a drawing.

Von einer Antenne 1 und einer Antenne 11 gehen je ein Empfangskanal aus. Ever go from a receiving channel by an antenna 1 and an antenna. 11

Jeder Empfangskanal besteht aus einem Verstärker 2 bzw. 12 , von denen eine Verbindung zu einem Schaltglied 6 führt, und bewertenden Gleich richtern 3, 4 bzw. 13 , 14 Diese sind mit einem Komparator 5 verbunden, dessen Ausgang an das Schaltglied 6 gelegt ist. Each receive channel consists of an amplifier 2 and 12, one of which performs a connection to a switching member 6, and evaluated rectifiers 3, 4 and 13, 14 These are connected to a comparator 5, the output of which is connected to the switching member. 6 Der Ausgang des Schaltgliedes 6 führt auf den Ausgangsverstärker 7 . The output of the switching element 6 leads to the output amplifier. 7 Die von den beiden Antennen 1, 12 be reitgestellte Empfangsspannung wird einer Auswertung zugeführt, die den höchsten Pegel einer Antenne an die Empfangseinrichtung weiterleitet. The BE of the two antennas 1, 12 riding detected receive voltage is supplied to an analysis which forwards the highest level of an antenna to the receiving device. Die Auswertung ist mit einer Hysterese versehen. The evaluation is provided with a hysteresis. Die Zuführung der Stromver sorgung 8 findet über das HF-Kabel statt. The feeding of the Stromver supply 8 takes place via the RF cable.

Die Empfangsspannungen werden in den Verstärkerstufen 2 und 12 getrennt verstärkt und anschließend in je einem bewerteten Gleichrichter 3 , 4 und 13 , 14 in eine Gleichspannung umgewandelt. The received voltages are separately amplified in the amplifier stages 2 and 12 and then converted in a respective rated rectifier 3, 4 and 13, 14 into a DC voltage. Diese Gleichspannungen werden einem Komparator 5 als Referenz- und Steuersignal zugeführt. These DC voltages are fed to a comparator 5 as a reference and control signal. Das Aus gangssignal des Komparators 5 steuert das Schaltglied 6 , welcher das höchste Signal an den Ausgangsverstärker 7 schaltet. From the output signal of the comparator 5 controls the switching member 6, which the highest signal connected to the output amplifier. 7 Das Schaltglied 7 trennt die Versorgungsspannung vom Nutzsignal, die durch gemeinsame Leitungen (zwei Adern) zugeführt werden. The circuit 7 separates the supply voltage from the useful signal, by common lines (two wires) are fed.

Die Einrichtung nach der Erfindung ermöglicht eine pegeleinbruchfreie HF-Übertragung und ist von der Länge der Zuleitungen unabhängig. The device according to the invention permits a level drop free RF transmission and is independent of the length of the leads.

Claims (1)

  1. Einrichtung zur pegeleinbruchfreien drahtlosen Übertragung von modu lierten HF-Signalen von einer ortsfesten Station nach einem Fahrzeug, wobei das Fahrzeug eine Empfangseinrichtung mit nachgeschalteten, in Fahrtrichtung hintereinander am Fahrzeug angeordneten Empfangsantennen besitzt, die mit einem längs der Strecke verlegten, in bestimmten Ab ständen gekreuzten Linienleiter induktiv gekoppelt sind, wobei das zu übertragende HF-Signal über zwei parallele Empfangskanäle geführt wird, dadurch gekennzeichnet, daß die beiden Empfangskanäle aus je einer Verstärkerstufe ( 2 , 12 ) und bewertenden Gleichrichtern ( 3 , 13 , 4 , 14 ) bestehen, die ihre Signale in einen Komparator ( 5 ) geben, wobei jeder Empfangskanal mit einem Ein gang eines Schaltgliedes ( 6 ) verbunden ist und das Ausgangssignal des Komparators ( 5 ) bestimmt, welcher von diesen Eingängen des Schalt gliedes ( 6 ) mit einem Ausgangsverstärker ( 7 ) verbunden wird. Means for level drop free wireless transmission of modu profiled RF signals of a fixed station for a vehicle, wherein the vehicle has a receiving device with downstream, successively arranged in the direction of travel of the vehicle receiving antennas with a along the path laid, stands in particular from cross-line cable are inductively coupled, said run to be transmitted RF signal via two parallel reception channels, characterized in that the two receiving channels from each of an amplifier stage (2, 12) and evaluated rectifiers (3, 13, 4, 14) are made, their output signals in a comparator (5), each receiving channel passage with a one of a switching element (6) is connected and the output signal of the comparator (5) determines which link of these inputs of the switch (6) connected to an output amplifier (7) becomes.
DE19883839421 1988-11-18 1988-11-18 Device for constant-level wireless transmission of modulated RF signals Withdrawn DE3839421A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19883839421 DE3839421A1 (en) 1988-11-18 1988-11-18 Device for constant-level wireless transmission of modulated RF signals

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19883839421 DE3839421A1 (en) 1988-11-18 1988-11-18 Device for constant-level wireless transmission of modulated RF signals

Publications (1)

Publication Number Publication Date
DE3839421A1 true DE3839421A1 (en) 1990-05-23

Family

ID=6367643

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19883839421 Withdrawn DE3839421A1 (en) 1988-11-18 1988-11-18 Device for constant-level wireless transmission of modulated RF signals

Country Status (1)

Country Link
DE (1) DE3839421A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595019A2 (en) * 1992-10-24 1994-05-04 Robert Bosch Gmbh Method and circuitry for the connection of several digital data channels in one transfer channel
DE10244115A1 (en) * 2002-09-12 2004-04-01 Siemens Ag Device for data transmission, especially in rail traffic
WO2005022777A1 (en) * 2003-09-03 2005-03-10 Koninklijke Philips Electronics N.V. Virtual-antenna receiver

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0595019A2 (en) * 1992-10-24 1994-05-04 Robert Bosch Gmbh Method and circuitry for the connection of several digital data channels in one transfer channel
EP0595019A3 (en) * 1992-10-24 1995-03-01 Bosch Gmbh Robert Method and circuitry for the connection of several digital data channels in one transfer channel.
US5650996A (en) * 1992-10-24 1997-07-22 Bode; Friedrich-Wilhelm Method and circuit arrangement for combining several digital data channels on a transmission channel
DE10244115A1 (en) * 2002-09-12 2004-04-01 Siemens Ag Device for data transmission, especially in rail traffic
DE10244115B4 (en) * 2002-09-12 2004-12-16 Siemens Ag Device for data transmission, especially in rail traffic
WO2005022777A1 (en) * 2003-09-03 2005-03-10 Koninklijke Philips Electronics N.V. Virtual-antenna receiver
US7573961B2 (en) 2003-09-03 2009-08-11 Koninklijke Philips Electronics N.V. Virtual-antenna receiver

Similar Documents

Publication Publication Date Title
EP0337171B1 (en) Method for the contactless measuring of a resistor arranged in the secondary circuit of a transmitter, and device for carrying out the method
EP0531725B1 (en) Multiantenne VHF receiver
DE3627193C2 (en)
EP0575389B1 (en) Arrangement for locating objects and for exchanging data with these objects
EP0521123B1 (en) Aerial diversity installation with at least two aerials for the mobile reception of metre and decimetre waves
EP0319782B1 (en) Radio wave receiver with several antennas
DE4017625C2 (en) Microwave responder
DE4000538C1 (en)
EP0066037B1 (en) Uhf receiver for a traffic information radio broadcasting system
DE2612996C2 (en)
EP0386678A1 (en) Active vehicle receiving antenna, its antenna conductor being provided on or in a non-conductive surface inserted in a metallic vehicle body
DE19919158A1 (en) Wireless switch detection system for automobile door or seat belt switch
EP0567889A2 (en) System for bidirectional data transmission between several fixed stations and one mobile station
DE19913919C1 (en) Motor vehicle data transmission system and data transmission method
DE4034429A1 (en) System for operation control of a GPS empfaengereinheit and a radio telephone unit for automobile
EP0627717B1 (en) Method and arrangement for wireless data exchange between a fixed station and moving objects
DE3817613A1 (en) Balun switching arrangement for hf-coils in magnetic resonance systems
EP0797312A2 (en) Transmit-receive switching with semiconductors
EP0758093A2 (en) Radar with reduced radiated power
DE4419189A1 (en) Device for diagnosing motor vehicles
DE4006007C2 (en) A communication system for transmitting data between a transmitting and a receiving platform platform
EP0806849A3 (en) Circuit arrangement for performance check of mobile broadcast reception systems
DE3903262C2 (en)
EP0204259B1 (en) Two-frequency instrument-landing system
DE4396900C2 (en) RF antenna switch esp. For switching between a first and second antenna

Legal Events

Date Code Title Description
8139 Disposal/non-payment of the annual fee